Estimating the roughness exponent of stochastic volatility from discrete observations of the integrated variance
从积分方差的离散观测估计随机波动率的粗糙指数AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接以随机波动率、积分方差、已实现方差和粗糙波动率模型为研究对象,最明确对应波动率计量。
从积分方差的离散观测估计随机波动率的粗糙指数AI 解读 ↓
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We consider the problem of estimating the roughness of the volatility process in a stochastic volatility model that arises as a nonlinear function of fractional Brownian motion with drift. To this end, we introduce a new estimator that measures the so-called roughness exponent of a continuous trajectory, based on discrete observations of its antiderivative. The estimator has a very simple form and can be computed with great efficiency on large data sets. It is not derived from distributional assumptions but from strictly pathwise considerations. We provide conditions on the underlying trajectory under which our estimator converges in a strictly pathwise sense. Then we verify that these conditions are satisfied by almost every sample path of fractional Brownian motion (with drift). As a consequence, we obtain strong consistency theorems in the context of a large class of rough volatility models, such as the rough fractional volatility model and the rough Bergomi model. We also demonstrate that our estimator is robust with respect to proxy errors between the integrated and realized variance, and that it can be applied to estimate the roughness exponent directly from the price trajectory. Numerical simulations show that our estimation procedure performs well after passing to a scale-invariant modification of our estimator.